Capacitance compensation module and method, self-capacitive touch display panel and display device

ABSTRACT

The present disclosure provides a capacitance compensation module, a capacitance compensation method, a self-capacitive touch display panel and a self-capacitive touch display device. The capacitance compensation module includes: a detection circuitry configured to detect an initial capacitance of a capacitor formed between each of the plurality of touch electrodes and the ground when the touch electrode is not being touched; a determination circuitry connected to the detection circuitry, and configured to determine whether the touch electrode is an abnormal touch electrode in accordance with the initial capacitance and output a compensation control signal when the touch electrode is the abnormal touch electrode; and a compensation circuitry connected to the determination circuitry and configured to, upon the receipt of the compensation control signal, apply a compensation voltage to the abnormal touch electrode, so as to enable the initial capacitance of the capacitor formed between the abnormal touch electrode and the ground to be within a standard capacitance range.

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims a priority of the Chinese patentapplication No. 201710580620.0 filed on Jul. 17, 2017, which isincorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the field of touch display technology,in particular to a capacitance compensation module, a capacitancecompensation method, a self-capacitive touch display panel, and aself-capacitive touch display device.

BACKGROUND

Conventional Full in Cell (FIC) touch display panel is an in-cellself-capacitive touch display panel. For the FIC touch display panel,touch lines are arranged at a single layer, and a multi-point touchoperation is achieved on the basis of a self-capacitance principle. Inorder to increase the resistance to Electro-Static Discharge (ESD), aground line is arranged at a periphery of the FIC touch display panel.At this time, a capacitance warpage may occur at the periphery of theFIC touch display panel, i.e., an initial capacitance of a capacitorformed between the ground and a touch electrode at the periphery of theFIC touch display panel may increase when the touch electrode is notbeing touched.

SUMMARY

In one aspect, the present disclosure provides in some embodiments acapacitance compensation module for use in a self-capacitive touchdisplay panel including a plurality of touch electrodes arranged on adisplay substrate. The capacitance compensation module includes: adetection circuitry configured to detect an initial capacitance of acapacitor formed between each of the plurality of touch electrodes andthe ground when the touch electrode is not being touched; adetermination circuitry connected to the detection circuitry, andconfigured to determine whether the touch electrode is an abnormal touchelectrode in accordance with the initial capacitance and output acompensation control signal when the touch electrode is the abnormaltouch electrode; and a compensation circuitry connected to thedetermination circuitry and configured to, upon the receipt of thecompensation control signal, apply a compensation voltage to theabnormal touch electrode, so as to enable the initial capacitance of thecapacitor formed between the abnormal touch electrode and the ground tobe within a standard capacitance range.

In a possible embodiment of the present disclosure, the detectioncircuitry is further configured to treat the initial capacitance througha predetermined algorithm, perform analog-to-digital conversion on thetreated capacitance so as to acquire raw data, and convert the raw datainto an original voltage applied to the touch electrode when the touchelectrode is not being touched. The determination circuitry is furtherconfigured to output the compensation control signal when the originalvoltage applied to the touch electrode is not within a standard voltagerange, and mark the touch electrode as the abnormal touch electrode.

In a possible embodiment of the present disclosure, the standard voltagerange is smaller than or equal to a first voltage threshold, or thestandard voltage range is smaller than or equal to the first voltagethreshold and greater than or equal to a second voltage threshold thatis smaller than the first voltage threshold.

In a possible embodiment of the present disclosure, when the standardvoltage range is smaller than or equal to the first voltage threshold,the compensation circuitry includes a compensation control signal inputend configured to receive the compensation control signal. The detectioncircuitry includes an original voltage output end configured to outputthe original voltage. The determination circuitry includes a voltagecomparator, a positive phase input end of which is connected to theoriginal voltage output end of the detection circuitry, a negative phaseinput end of which is connected to a first voltage threshold input end,and an output end of which is connected to the compensation controlsignal input end.

In a possible embodiment of the present disclosure, when the standardvoltage range is smaller than or equal to the first voltage thresholdand greater than or equal to the second voltage threshold that issmaller than the first voltage threshold, the compensation circuitryincludes a compensation control signal input end configured to receivethe compensation control signal. The detection circuitry includes anoriginal voltage output end configured to output the original voltage.The determination circuitry includes a first voltage comparator, asecond voltage comparator, and an OR gate. A positive phase input end ofthe first voltage comparator is connected to the original voltage outputend of the detection circuitry, a negative phase input end of the firstvoltage comparator is connected to a first voltage threshold input end,and an output end of the first voltage comparator is connected to afirst input end of the OR gate. A positive phase input end of the secondvoltage comparator is connected to a second voltage threshold input end,a negative phase input end of the second voltage comparator is connectedto the original voltage output end of the detection circuitry, and anoutput end of the second voltage comparator is connected to a secondinput end of the OR gate. An output end of the OR gate is connected tothe compensation control signal input end.

In a possible embodiment of the present disclosure, the compensationcircuitry further includes: a compensation voltage output end configuredto output the compensation voltage; a control switch transistor, a gateelectrode of which is connected to the compensation control signal inputend, and a first electrode of which is connected to a high power sourcevoltage input end; a first divider resistor unit, a first end of whichis connected to a second electrode of the control switch transistor, anda second end of which is connected to the compensation voltage outputend; and a second divider resistor unit, a first end of which isconnected to the compensation voltage output end, and a second end ofwhich is connected to a low power source voltage input end.

In another aspect, the present disclosure provides in some embodiments acapacitance compensation method for use in the above-mentionedcapacitance compensation module, including: detecting, by the detectioncircuitry, an initial capacitance of a capacitor formed between each ofa plurality of touch electrodes included in a self-capacitive touchdisplay panel and the ground when the touch electrode is not beingtouched; outputting a compensation control signal when the determinationcircuitry determines that the touch electrode is an abnormal touchelectrode in accordance with the initial capacitance; and applying, bythe compensation circuitry, a compensation voltage to the abnormal touchelectrode upon the receipt of the compensation control signal, so as toenable the initial capacitance of the capacitor formed between theabnormal touch electrode and the ground to be within a standardcapacitance range.

In a possible embodiment of the present disclosure, subsequent todetecting, by the detection circuitry, the initial capacitance of thecapacitor formed between each of the plurality of touch electrodesincluded in the self-capacitive touch display panel and the ground whenthe touch electrode is not being touched, the capacitance compensationmethod further includes treating, by the detection circuitry, theinitial capacitance through a predetermined algorithm, performinganalog-to-digital conversion on the treated initial capacitance so as toacquire raw data, and converting the raw data into an original voltageapplied to the touch electrode when the touch electrode is not beingtouched. The outputting the compensation control signal when thedetermination circuitry determines that the touch electrode is theabnormal touch electrode in accordance with the initial capacitanceincludes outputting the compensation control signal when thedetermination circuitry determines that the original voltage applied tothe touch electrode is not within a standard voltage range, and markingthe touch electrode as the abnormal touch electrode.

In a possible embodiment of the present disclosure, the standard voltagerange is smaller than or equal to a first voltage threshold, or thestandard voltage range is smaller than or equal to the first voltagethreshold and greater than or equal to a second voltage threshold thatis smaller than the first voltage threshold.

In yet another aspect, the present disclosure provides in someembodiments a self-capacitive touch display panel including theabove-mentioned capacitance compensation module.

In still yet another aspect, the present disclosure provides in someembodiments a self-capacitive touch display device including theabove-mentioned self-capacitive touch display panel.

In a possible embodiment of the present disclosure, the self-capacitivetouch display device further includes a driving integrated circuit (IC).The compensation circuitry of the capacitance compensation moduleincluded in the self-capacitive touch display panel is configured to,upon the receipt of the compensation control signal, apply acompensation voltage to an abnormal touch electrode via the driving IC,so as to enable an initial capacitance of a capacitor formed between theabnormal touch electrode and the ground is within a standard capacitancerange.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to illustrate the technical solutions of the present disclosureor the related art in a clearer manner, the drawings desired for thepresent disclosure or the related art will be described hereinafterbriefly. Obviously, the following drawings merely relate to someembodiments of the present disclosure, and based on these drawings, aperson skilled in the art may obtain the other drawings without anycreative effort.

FIG. 1 is a schematic view showing a capacitance compensation moduleaccording to one embodiment of the present disclosure;

FIG. 2 is a circuit diagram of the capacitance compensation moduleaccording to one embodiment of the present disclosure;

FIG. 3 is another circuit diagram of the capacitance compensation moduleaccording to one embodiment of the present disclosure;

FIG. 4 is yet another circuit diagram of the capacitance compensationmodule according to one embodiment of the present disclosure;

FIG. 5 is still yet another circuit diagram of the capacitancecompensation module according to one embodiment of the presentdisclosure;

FIG. 6 is a flow chart of a capacitance compensation method according toone embodiment of the present disclosure; and

FIG. 7 is a schematic view showing a self-capacitance touch displaydevice according to one embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In order to make the objects, the technical solutions and the advantagesof the present disclosure more apparent, the present disclosure will bedescribed hereinafter in a clear and complete manner in conjunction withthe drawings and embodiments. Obviously, the following embodimentsmerely relate to a part of, rather than all of, the embodiments of thepresent disclosure, and based on these embodiments, a person skilled inthe art may, without any creative effort, obtain the other embodiments,which also fall within the scope of the present disclosure.

The present disclosure provides in some embodiments a capacitancecompensation module for use in a self-capacitive touch display panel.The self-capacitive touch display panel includes a plurality of touchelectrodes arranged on a display substrate. As shown in FIG. 1, thecapacitance compensation module includes: a detection circuitry 11configured to detect an initial capacitance of a capacitor formedbetween each of the plurality of touch electrodes and the ground whenthe touch electrode is not being touched; a determination circuitry 12connected to the detection circuitry 11, and configured to determinewhether the touch electrode is an abnormal touch electrode in accordancewith the initial capacitance and output a compensation control signalwhen the touch electrode is the abnormal touch electrode; and acompensation circuitry 13 connected to the determination circuitry 12and configured to, upon the receipt of the compensation control signal,apply a compensation voltage to the abnormal touch electrode, so as toenable the initial capacitance of the capacitor formed between theabnormal touch electrode and the ground to be within a standardcapacitance range.

According to the capacitance compensation module in the embodiments ofthe present disclosure, the detection circuitry 11 detects the initialcapacitance. The determination circuitry 12 determines whether the touchelectrode is the abnormal touch electrode in accordance with the initialcapacitance, and outputs the compensation control signal when the touchelectrode is the abnormal touch electrode. Upon the receipt of thecompensation control signal, the compensation circuitry 13 applies thecompensation voltage to the abnormal touch electrode, so as to enablethe initial capacitance of the abnormal touch electrode to be within thestandard capacitance range. As a result, it is able to provide a uniformfull-screen capacitance, improve the yield of a touch member of theself-capacitive touch display panel, and prevent the occurrence of acapacitance warpage at a periphery of the self-capacitive touch displaypanel. In addition, it is able to improve the yield of the touch displaypanel, and reduce the manufacture cost.

The capacitance compensation module in the embodiments of the presentdisclosure may be applied to an FIC touch display panel which is anin-cell self-capacitive touch display panel. For the FIC touch displaypanel, touch lines are arranged at a single layer, and a multi-pointtouch operation is achieved on the basis of a self-capacitanceprinciple. In order to increase the resistance to ESD, a ground line isarranged at a periphery of the FIC touch display panel. At this time, acapacitance warpage may occur at the periphery of the FIC touch displaypanel, i.e., an initial capacitance of a capacitor formed between theground and a touch electrode at the periphery of the FIC touch displaypanel may increase when the touch electrode is not being touched.Through the capacitance compensation module in the embodiments of thepresent disclosure, it is able to effectively solve the above-mentionedproblem.

In the embodiments of the present disclosure, the detection circuitry 11collects the initial capacitance, the determination circuitry 12determines the abnormal touch electrode, and the compensation circuitry13 compensates for the voltage applied to the abnormal touch electrode,so as to prevent the occurrence of any fault due to the capacitancewarpage. In actual use, capacitance detection software may be providedin the detection circuitry 11.

In a possible embodiment of the present disclosure, the detectioncircuitry 11 is further configured to treat the initial capacitancethrough a predetermined algorithm, perform analog-to-digital conversionon the treated capacitance so as to acquire raw data, and convert theraw data into an original voltage Ui applied to the touch electrode whenthe touch electrode is not being touched.

The determination circuitry 12 is further configured to output thecompensation control signal when the original voltage Ui applied to thetouch electrode is not within a standard voltage range, and mark thetouch electrode as the abnormal touch electrode.

During the implementation, with respect to a Not-Good (NG) display panelwhere there is an edge warpage for the raw data, the detection circuitry11 may treat the initial capacitance through the predeterminedalgorithm, and perform the analog-to-digital conversion on the treatedinitial capacitance to acquire the raw data (which is calculated duringthe operation of the conventional touch display panel), and then convertthe raw data into the original voltage Ui applied to the touchelectrode. Then, the determination circuitry 12 may determine whetherthe touch electrode is the abnormal touch electrode in accordance withthe original voltage Ui.

The raw voltage is acquired after treating the initial capacitance usingtouch testing and debugging software provided by IC manufacturers withrespect to a specific FIC touch display product, and then performing theanalog-to-digital conversion.

When the detection circuitry 11 detects the initial capacitance of thecapacitor formed between the touch electrode and the ground, theoriginal voltage Ui may be generated across two ends of the capacitordue to a charging operation. A relationship between the original voltageUi and the initial capacitance C may be represented as C=Q/Ui, where Qrepresents a quantity of charges stored in the capacitor. In otherwords, the raw data may be converted into the original voltage Ui.

In actual use, a standard data voltage range for the NG display panelmay be (α, β), and the standard voltage range for the NG display panelmay be (Uα, Uβ), where β represents a first data voltage threshold, αrepresents a second data voltage threshold, Uβ represents a firstvoltage threshold, and Uα represents a second voltage threshold. Whenfor a certain touch electrode, Uα≤Ui≤Uβ, i.e., the data voltagecorresponding to the touch electrode is within the standard data voltagerange, it may be determined that the touch electrode is a normal touchelectrode. When Ui<Uα or Uβ<Ui, i.e., the data voltage corresponding tothe touch electrode is not within the standard data voltage range, itmay be determined that the touch electrode is the abnormal touchelectrode. Due to the warpage (i.e., a large data voltage at the edge),in actual use, the abnormal touch electrode may be determined merelytaking whether Ui>Uβ into consideration.

To be specific, the standard voltage range may be smaller than or equalto the first voltage threshold Uβ, or the standard voltage range may besmaller than or equal to the first voltage threshold Uβ and greater thanor equal to the second voltage threshold Uα that is smaller than thefirst voltage threshold Uβ.

In a possible embodiment of the present disclosure, when the standardvoltage range is smaller than or equal to the first voltage thresholdUβ, as shown in FIG. 2, the compensation circuitry 13 includes acompensation control signal input end configured to receive thecompensation control signal Vout (in FIG. 2, the compensation controlsignal Vout is a voltage signal). The detection circuitry 11 includes anoriginal voltage output end configured to output the original voltageUi.

The determination circuitry 12 includes a voltage comparator VC1, apositive phase input end of which is connected to the original voltageoutput end of the detection circuitry 11, a negative phase input end ofwhich is connected to a first voltage threshold input end for inputtingthe first voltage threshold Uβ, and an output end of which is connectedto the compensation control signal input end.

During the operation of the capacitance compensation module in FIG. 2,when Ui is smaller than or equal to the first voltage threshold Uβ, thevoltage comparator VC1 may output a low voltage signal (corresponding toa digital signal “0”), i.e., the compensation control signal Vout is alow voltage signal. In addition, when Ui is greater than the firstvoltage threshold Uβ, the voltage comparator VC1 may output a highvoltage signal (corresponding to a digital signal “1”), i.e., thecompensation control signal Vout is a high voltage signal.

In another possible embodiment of the present disclosure, when thestandard voltage range is smaller than or equal to the first voltagethreshold Uβ and greater than or equal to the second voltage thresholdUα that is smaller than the first voltage threshold Uβ, as shown in FIG.3, the compensation circuitry 13 includes a compensation control signalinput end configured to receive the compensation control signal Vout.The detection circuitry 11 includes an original voltage output endconfigured to output the original voltage Ui.

The determination circuitry 12 includes a first voltage comparator VC1,a second voltage comparator VC2, and an OR gate ORG. A positive phaseinput end of the first voltage comparator VC1 is connected to theoriginal voltage output end of the detection circuitry 11, a negativephase input end of the first voltage comparator VC1 is connected to afirst voltage threshold input end for inputting the first voltagethreshold Uβ, and an output end of the first voltage comparator VC1 isconnected to a first input end of the OR gate ORG. A positive phaseinput end of the second voltage comparator VC2 is connected to a secondvoltage threshold input end for inputting the second voltage thresholdUα, a negative phase input end of the second voltage comparator VC2 isconnected to the original voltage output end of the detection circuitry11, and an output end of the second voltage comparator VC2 is connectedto a second input end of the OR gate ORG. An output end of the OR gateORG is connected to the compensation control signal input end of thecompensation circuitry 13 for receiving the compensation control signalVout.

During the operation of the capacitance compensation module in FIG. 3,when Ui is smaller than or equal to the first voltage threshold Uβ, thevoltage comparator VC1 may output the low voltage signal, the firstinput end of the OR gate ORG may receive the low voltage signal. Inaddition, when Ui is greater than the first voltage threshold Uβ, thevoltage comparator VC1 may output the high voltage signal, and the firstinput end of the OR gate ORG may receive the high voltage signal.

When Ui is smaller than or equal to the second voltage threshold Uα, thevoltage comparator VC1 may output the high voltage signal, and thesecond input end of the OR gate ORG may receive the high voltage signal.In addition, when Ui is greater than the second voltage threshold Uα,the voltage comparator VC1 may output the low voltage signal, and thesecond input end of the OR gate ORG may receive the low voltage signal.

When Ui is within the standard voltage range, i.e., when Ui is smallerthan or equal to Uβ and greater than or equal to Uα, the first input endof the OR gate ORG may receive the low voltage signal (corresponding tothe digital signal “0”), and the second input end of the OR gate ORG mayalso receive the low voltage signal (corresponding to the digital signal“0”). At this time, the OR gate ORG may output the low voltage signal(corresponding to the digital signal “0”).

When Ui is not within the standard voltage range, there are thefollowing two circumstances.

In a first circumstance, when Ui is greater than Uβ, Ui may be certainlygreater than Uα. The first input end of the OR gate ORG may receive thehigh voltage signal (corresponding to the digital signal “1”), thesecond input end of the OR gate ORG may receive the low voltage signal(corresponding to the digital signal “0”), so the OR gate ORG may outputthe high voltage signal (corresponding to the digital signal “1”). Atthis time, the compensation control signal Vout is the high voltagesignal.

In a second circumstance, when Ui is smaller than Uα, Ui may becertainly smaller than Uβ. The first input end of the OR gate ORG mayreceive the low voltage signal (corresponding to the digital signal“0”), the second input end of the OR gate ORG may receive the highvoltage signal (corresponding to the digital signal “1”), so the OR gateORG may output the high voltage signal (corresponding to the digitalsignal “1”). At this time, the compensation control signal Vout is thehigh voltage signal.

To be specific, the compensation circuitry may further include: acompensation voltage output end configured to output the compensationvoltage; a control switch transistor, a gate electrode of which isconnected to the compensation control signal input end, and a firstelectrode of which is connected to a high power source voltage inputend; a first divider resistor unit, a first end of which is connected toa second electrode of the control switch transistor, and a second end ofwhich is connected to the compensation voltage output end; and a seconddivider resistor unit, a first end of which is connected to thecompensation voltage output end, and a second end of which is connectedto a low power source voltage input end.

During the implementation, as shown in FIG. 4, the compensation circuit13 may include: a compensation control signal input end for receivingthe compensation control signal Vout; a compensation voltage output endconfigured to output the compensation voltage Uo; a control switchtransistor VT, a gate electrode of which is connected to thecompensation control signal input end (for receiving the compensationcontrol signal Vout), and a drain electrode of which is connected to ahigh power source voltage input end for inputting a high power sourcevoltage VDD; a first divider resistor R1, a first end of which isconnected to a source electrode of the control switch transistor VT, anda second end of which is connected to the compensation voltage outputend; and a second divider resistor R2, a first end of which is connectedto the compensation voltage output end, and a second end of which isconnected to a low power source voltage input end for inputting a lowpower source voltage VSS.

In FIG. 4, VT is an n-type transistor. However, in actual use, VT mayalso be a p-type transistor. Here, a type of the transistor will not beparticularly defined.

During the operation of the capacitance compensation module in FIG. 4,when a high voltage signal is applied to the gate electrode of VT, i.e.,when Ui is not within the standard voltage range, VT may be turned on.At this time, Uo is equal to (VDD−VSS)*RZ2/(RZ1+RZ2), where RZ1represents a resistance of the first divider resistor R1, and RZ2represents a resistance of the second divider resistor R2. In otherwords, the compensation for the capacitance is completed through thecompensation for the voltage. An appropriate value of each of RZ1 andRZ2 needs to be acquired statistically in accordance with a large numberof data.

When a low voltage signal is applied to the gate electrode of VT, i.e.,Ui is within the standard voltage range, VT may be turned off. At thistime, it is able to compensate for the capacitance without through thecompensation for the voltage.

The capacitance compensation module will be described hereinafter inconjunction with a specific embodiment.

As shown in FIG. 5, the capacitance compensation module includes thedetection circuitry 11, the determination circuitry 12 and thecompensation circuitry 13.

The detection circuitry 11 is configured to detect the initialcapacitance of the capacitor formed between each of the plurality oftouch electrodes and the ground when the touch electrode is not beingtouched, treat the initial capacitance through the predeterminedalgorithm, perform the analog-to-digital conversion on the treatedinitial capacitance to acquire the raw data, and convert the raw datainto the original voltage Ui applied to the touch electrode.

The determination circuitry 12 includes the voltage comparator VC1. Thecompensation circuitry 13 includes the compensation control signal inputend for receiving the compensation control signal Vout. In theembodiment of the present disclosure, the compensation control signal isa voltage signal.

The positive phase input end of the voltage comparator VC1 is connectedto the original voltage output end (for outputting the original voltageUi) of the detection circuitry 11, the negative phase input end thereofis connected to the first voltage threshold input end for inputting thefirst voltage threshold Uβ, and the output end thereof is connected tothe compensation control signal input end (for receiving thecompensation control signal Vout).

The compensation circuitry 13 includes: the compensation voltage outputend configured to output the compensation voltage Uo; the control switchtransistor VT, a gate electrode of which is connected to thecompensation control signal input end (for receiving the compensationcontrol signal Vout), and the drain electrode of which is connected tothe high power source voltage input end for inputting the high powersource voltage VDD; the first divider resistor R1, a first end of whichis connected to the source electrode of the control switch transistorVT, and a second end of which is connected to the compensation voltageoutput end; and the second divider resistor R2, a first end of which isconnected to the compensation voltage output end (for outputting thecompensation voltage Uo), and a second end of which is connected to thelow power source voltage end for inputting the low power source voltageVSS.

For the capacitance compensation module in FIG. 5, the determinationcircuitry includes the voltage comparator, and the compensationcircuitry includes the control switch transistor and the divider-typevoltage compensation circuitry. Hence, the determination circuitry andthe compensation circuitry may cooperate with each other to achieve thefunctions of determining an abnormal capacitance point and compensatingfor the voltage.

During the operation of the capacitance compensation module in FIG. 5,when Ui<Vout is a low voltage signal (corresponding to a digital signal“0”). At this time, VT may be turned off, and Uo may be 0. The raw datacorresponding to the touch electrode is within a standard limitspecification range.

In addition, when Ui>Vout is a high voltage signal. At this time, VT maybe turned on, and Uo=Ui*R2/(R1+R2). When Uo<Uβ, a requirement may bemet. When the raw data corresponding to a point is beyond the standardlimit specification range, this point may be an abnormal point, and thecompensation voltage Uo may be equal to (VDD−VSS)*RZ2/(RZ1+RZ2), whereRZ1 represents a resistance of the first divider resistor R1, and RZ2represents a resistance of the second divider resistor R2. Anappropriate value of each of RZ1 and RZ2 needs to be acquiredstatistically in accordance with a large number of data.

The present disclosure further provides in some embodiments acapacitance compensation method for use in the above-mentionedcapacitance compensation module. As shown in FIG. 6, the capacitancecompensation method includes: Step S1 of detecting, by the detectioncircuitry, an initial capacitance of a capacitor formed between each ofa plurality of touch electrodes included in a self-capacitive touchdisplay panel and the ground when the touch electrode is not beingtouched; Step S2 of outputting a compensation control signal when thedetermination circuitry determines that the touch electrode is anabnormal touch electrode in accordance with the initial capacitance; andStep S3 of applying, by the compensation circuitry, a compensationvoltage to the abnormal touch electrode upon the receipt of thecompensation control signal, so as to enable the initial capacitance ofthe capacitor formed between the abnormal touch electrode and the groundto be within a standard capacitance range.

According to the capacitance compensation method in the embodiments ofthe present disclosure, the detection circuitry detects the initialcapacitance. The determination circuitry determines whether the touchelectrode is the abnormal touch electrode in accordance with the initialcapacitance, and outputs the compensation control signal when the touchelectrode is the abnormal touch electrode. Upon the receipt of thecompensation control signal, the compensation circuitry applies thecompensation voltage to the abnormal touch electrode, so as to enablethe initial capacitance of the abnormal touch electrode to be within thestandard capacitance range. As a result, it is able to provide a uniformfull-screen capacitance, improve the yield of a touch member of theself-capacitive touch display panel, and prevent the occurrence of thecapacitance warpage at a periphery of the self-capacitive touch displaypanel.

To be specific, subsequent to detecting, by the detection circuitry, theinitial capacitance of the capacitor formed between each of theplurality of touch electrodes included in the self-capacitive touchdisplay panel and the ground when the touch electrode is not beingtouched, the capacitance compensation method further includes treating,by the detection circuitry, the initial capacitance through apredetermined algorithm, performing analog-to-digital conversion on thetreated initial capacitance so as to acquire raw data, and convertingthe raw data into an original voltage applied to the touch electrodewhen the touch electrode is not being touched. The outputting thecompensation control signal when the determination circuitry determinesthat the touch electrode is the abnormal touch electrode in accordancewith the initial capacitance includes outputting the compensationcontrol signal when the determination circuitry determines that theoriginal voltage applied to the touch electrode is not within a standardvoltage range, and marking the touch electrode as the abnormal touchelectrode.

In actual use, the standard voltage range may be smaller than or equalto a first voltage threshold, or the standard voltage range may besmaller than or equal to the first voltage threshold and greater than orequal to a second voltage threshold that is smaller than the firstvoltage threshold.

The present disclosure further provides in some embodiments aself-capacitive touch display panel including the above-mentionedcapacitance compensation module.

The present disclosure further provides in some embodiments aself-capacitive touch display device including the above-mentionedself-capacitive touch display panel.

During the implementation, as shown in FIG. 7, the self-capacitive touchdisplay device 100 may further include a driving IC 110.

The compensation circuitry 13 of the capacitance compensation module1200 included in the self-capacitive touch display panel 120 isconfigured to, upon the receipt of the compensation control signal,apply a compensation voltage to an abnormal touch electrode via thedriving IC 110, so as to enable an initial capacitance of a capacitorformed between the abnormal touch electrode and the ground is within astandard capacitance range.

Unless otherwise defined, such words as “one” or “one of” are merelyused to represent the existence of at least one member, rather than tolimit the number thereof. For example, such words as “a compound” or “atleast one compound” may include a plurality of compounds, e.g., amixture thereof.

The word “illustrative” merely refers to an example or instance, and any“illustrative” embodiment shall not be necessarily understood as apreferred embodiment, or being advantageous over any other embodiments,and/or excluding a combination of the features from the otherembodiments.

The word “possible” refers to the feature involved in a certainembodiment is not provided in the other embodiment. Any specificembodiment of the present disclosure may include a plurality of“possible” features, in the case of no conflict.

Each embodiment in the present disclosure may be described in the formof a certain range. It should be appreciated that, the description inthe form of the certain range is merely for convenience andclarification, but shall not be construed as limiting the scope of thepresent disclosure. Hence, the range shall be deemed as including allpossible sub-ranges as well as any single value within the range,regardless of a width of the range. For example, the description “withinthe range of 1 to 6: shall be deemed as including such sub-ranges as“the range of 1 to 3”, “the range of 1 to 4”, “the range of 2 to 4”,“the range of 2 to 6”, “the range of 3 to 6”, and any single valuewithin the range, e.g., 1, 2, 3, 4, 5 and 6.

In the case that a specific numerical range is specified, it shallinclude all numbers (fractional or integral numbers) within thenumerical range. Such expressions as “within the range of a first numberto a second number” or “ranging from a first number to a second number”are intended to include the first number, the second number and anyfractional and integral numbers between the first number and the secondnumber.

It should be further appreciated that, for clarification, some featuresare separately described in several embodiments, but they may also becombined in a single embodiment. Also, the features described in asingle embodiment may also be described separately, or in anyappropriate combinations, in the other embodiments. Some featuresdescribed in a certain embodiment shall not be deemed as necessaryfeatures for the embodiment, unless the embodiment is unfeasible withoutthese features.

The above embodiments are for illustrative purposes only, but thepresent disclosure is not limited thereto. Obviously, a person skilledin the art may make further modifications and improvements withoutdeparting from the spirit of the present disclosure, and thesemodifications and improvements shall also fall within the scope of thepresent disclosure.

1. A capacitance compensation module for use in a self-capacitive touchdisplay panel, the self-capacitive touch display panel comprising aplurality of touch electrodes arranged on a display substrate, thecapacitance compensation module comprising: a detection circuitryconfigured to detect an initial capacitance of a capacitor formedbetween each of the plurality of touch electrodes and the ground whenthe touch electrode is not being touched; a determination circuitryconnected to the detection circuitry, and configured to determinewhether the touch electrode is an abnormal touch electrode in accordancewith the initial capacitance and output a compensation control signalwhen the touch electrode is the abnormal touch electrode; and acompensation circuitry connected to the determination circuitry andconfigured to, upon the receipt of the compensation control signal,apply a compensation voltage to the abnormal touch electrode, so as toenable the initial capacitance of the capacitor formed between theabnormal touch electrode and the ground to be within a standardcapacitance range.
 2. The capacitance compensation module according toclaim 1, wherein the detection circuitry is further configured to treatthe initial capacitance through a predetermined algorithm, performanalog-to-digital conversion on the treated capacitance so as to acquireraw data, and convert the raw data into an original voltage applied tothe touch electrode when the touch electrode is not being touched, andthe determination circuitry is further configured to output thecompensation control signal when the original voltage applied to thetouch electrode is not within a standard voltage range, and mark thetouch electrode as the abnormal touch electrode.
 3. The capacitancecompensation module according to claim 2, wherein the standard voltagerange is smaller than or equal to a first voltage threshold, or thestandard voltage range is smaller than or equal to the first voltagethreshold and greater than or equal to a second voltage threshold thatis smaller than the first voltage threshold.
 4. The capacitancecompensation module according to claim 3, wherein when the standardvoltage range is smaller than or equal to the first voltage threshold,the compensation circuitry comprises a compensation control signal inputend configured to receive the compensation control signal; the detectioncircuitry comprises an original voltage output end configured to outputthe original voltage; and the determination circuitry comprises avoltage comparator, a positive phase input end of which is connected tothe original voltage output end of the detection circuitry, a negativephase input end of which is connected to a first voltage threshold inputend, and an output end of which is connected to the compensation controlsignal input end.
 5. The capacitance compensation module according toclaim 3, wherein when the standard voltage range is smaller than orequal to the first voltage threshold and greater than or equal to thesecond voltage threshold that is smaller than the first voltagethreshold, the compensation circuitry comprises a compensation controlsignal input end configured to receive the compensation control signal;the detection circuitry comprises an original voltage output endconfigured to output the original voltage; the determination circuitrycomprises a first voltage comparator, a second voltage comparator, andan OR gate; a positive phase input end of the first voltage comparatoris connected to the original voltage output end of the detectioncircuitry, a negative phase input end of the first voltage comparator isconnected to a first voltage threshold input end, and an output end ofthe first voltage comparator is connected to a first input end of the ORgate; a positive phase input end of the second voltage comparator isconnected to a second voltage threshold input end, a negative phaseinput end of the second voltage comparator is connected to the originalvoltage output end of the detection circuitry, and an output end of thesecond voltage comparator is connected to a second input end of the ORgate; and an output end of the OR gate is connected to the compensationcontrol signal input end.
 6. The capacitance compensation moduleaccording to claim 4, wherein the compensation circuitry furthercomprises: a compensation voltage output end configured to output thecompensation voltage; a control switch transistor, a gate electrode ofwhich is connected to the compensation control signal input end, and afirst electrode of which is connected to a high power source voltageinput end; a first divider resistor unit, a first end of which isconnected to a second electrode of the control switch transistor, and asecond end of which is connected to the compensation voltage output end;and a second divider resistor unit, a first end of which is connected tothe compensation voltage output end, and a second end of which isconnected to a low power source voltage input end.
 7. A capacitancecompensation method for use in the capacitance compensation moduleaccording to claim 1, comprising: detecting, by the detection circuitry,an initial capacitance of a capacitor formed between each of a pluralityof touch electrodes included in a self-capacitive touch display paneland the ground when the touch electrode is not being touched; outputtinga compensation control signal when the determination circuitrydetermines that the touch electrode is an abnormal touch electrode inaccordance with the initial capacitance; and applying, by thecompensation circuitry, a compensation voltage to the abnormal touchelectrode upon the receipt of the compensation control signal, so as toenable the initial capacitance of the capacitor formed between theabnormal touch electrode and the ground to be within a standardcapacitance range.
 8. The capacitance compensation method according toclaim 7, wherein subsequent to detecting, by the detection circuitry,the initial capacitance of the capacitor formed between each of theplurality of touch electrodes included in the self-capacitive touchdisplay panel and the ground when the touch electrode is not beingtouched, the capacitance compensation method further comprises treating,by the detection circuitry, the initial capacitance through apredetermined algorithm, performing analog-to-digital conversion on thetreated initial capacitance so as to acquire raw data, and convertingthe raw data into an original voltage applied to the touch electrodewhen the touch electrode is not being touched, wherein the outputtingthe compensation control signal when the determination circuitrydetermines that the touch electrode is the abnormal touch electrode inaccordance with the initial capacitance includes outputting thecompensation control signal when the determination circuitry determinesthat the original voltage applied to the touch electrode is not within astandard voltage range, and marking the touch electrode as the abnormaltouch electrode.
 9. The capacitance compensation method according toclaim 8, wherein the standard voltage range is smaller than or equal toa first voltage threshold, or the standard voltage range is smaller thanor equal to the first voltage threshold and greater than or equal to asecond voltage threshold that is smaller than the first voltagethreshold.
 10. A self-capacitive touch display panel, comprising acapacitance compensation module, wherein the capacitance compensationmodule is configured for use in a self-capacitive touch display panel,the self-capacitive touch display panel comprising a plurality of touchelectrodes arranged on a display substrate, the capacitance compensationmodule comprising: a detection circuitry configured to detect an initialcapacitance of a capacitor formed between each of the plurality of touchelectrodes and the ground when the touch electrode is not being touched;a determination circuitry connected to the detection circuitry, andconfigured to determine whether the touch electrode is an abnormal touchelectrode in accordance with the initial capacitance and output acompensation control signal when the touch electrode is the abnormaltouch electrode; and a compensation circuitry connected to thedetermination circuitry and configured to, upon the receipt of thecompensation control signal, apply a compensation voltage to theabnormal touch electrode, so as to enable the initial capacitance of thecapacitor formed between the abnormal touch electrode and the ground tobe within a standard capacitance range.
 11. A self-capacitive touchdisplay device, comprising the self-capacitive touch display panelaccording to claim
 10. 12. The self-capacitive touch display deviceaccording to claim 11, further comprising a driving integrated circuit(IC), wherein the compensation circuitry of the capacitance compensationmodule included in the self-capacitive touch display panel is configuredto, upon the receipt of the compensation control signal, apply acompensation voltage to an abnormal touch electrode via the driving IC,so as to enable an initial capacitance of a capacitor formed between theabnormal touch electrode and the ground is within a standard capacitancerange.
 13. The self-capacitive touch display panel according to claim10, wherein the detection circuitry is further configured to treat theinitial capacitance through a predetermined algorithm, performanalog-to-digital conversion on the treated capacitance so as to acquireraw data, and convert the raw data into an original voltage applied tothe touch electrode when the touch electrode is not being touched, andthe determination circuitry is further configured to output thecompensation control signal when the original voltage applied to thetouch electrode is not within a standard voltage range, and mark thetouch electrode as the abnormal touch electrode.
 14. The self-capacitivetouch display panel according to claim 13, wherein the standard voltagerange is smaller than or equal to a first voltage threshold, or thestandard voltage range is smaller than or equal to the first voltagethreshold and greater than or equal to a second voltage threshold thatis smaller than the first voltage threshold.
 15. The capacitancecompensation module according to claim 14, wherein when the standardvoltage range is smaller than or equal to the first voltage threshold,the compensation circuitry comprises a compensation control signal inputend configured to receive the compensation control signal; the detectioncircuitry comprises an original voltage output end configured to outputthe original voltage; and the determination circuitry comprises avoltage comparator, a positive phase input end of which is connected tothe original voltage output end of the detection circuitry, a negativephase input end of which is connected to a first voltage threshold inputend, and an output end of which is connected to the compensation controlsignal input end.
 16. The self-capacitive touch display panel accordingto claim 14, wherein when the standard voltage range is smaller than orequal to the first voltage threshold and greater than or equal to thesecond voltage threshold that is smaller than the first voltagethreshold, the compensation circuitry comprises a compensation controlsignal input end configured to receive the compensation control signal;the detection circuitry comprises an original voltage output endconfigured to output the original voltage; the determination circuitrycomprises a first voltage comparator, a second voltage comparator, andan OR gate; a positive phase input end of the first voltage comparatoris connected to the original voltage output end of the detectioncircuitry, a negative phase input end of the first voltage comparator isconnected to a first voltage threshold input end, and an output end ofthe first voltage comparator is connected to a first input end of the ORgate; a positive phase input end of the second voltage comparator isconnected to a second voltage threshold input end, a negative phaseinput end of the second voltage comparator is connected to the originalvoltage output end of the detection circuitry, and an output end of thesecond voltage comparator is connected to a second input end of the ORgate; and an output end of the OR gate is connected to the compensationcontrol signal input end.
 17. The self-capacitive touch display panelaccording to claim 15, wherein the compensation circuitry furthercomprises: a compensation voltage output end configured to output thecompensation voltage; a control switch transistor, a gate electrode ofwhich is connected to the compensation control signal input end, and afirst electrode of which is connected to a high power source voltageinput end; a first divider resistor unit, a first end of which isconnected to a second electrode of the control switch transistor, and asecond end of which is connected to the compensation voltage output end;and a second divider resistor unit, a first end of which is connected tothe compensation voltage output end, and a second end of which isconnected to a low power source voltage input end.
 18. Theself-capacitive touch display panel according to claim 10, wherein theself-capacitive touch display panel is a Full In Cell (FIC) touchdisplay panel.
 19. The capacitance compensation module according toclaim 6, wherein the control switch transistor is an N-type transistor.20. The capacitance compensation module according to claim 6, whereinthe control switch transistor is a P-type transistor.